Go template is broken for me

[shamansir]

I am running hello-go on aarch64-darwin and while I am learning flakes (and nix) with the help of this post, I get this error:

> nix flake init --template templates#go-hello
wrote: /first-steps/hello-go/go.mod
wrote: /first-steps/hello-go/flake.nix
wrote: /first-steps/hello-go/main.go
> nix run
warning: creating lock file '/first-steps/hello-go/flake.lock':
• Added input 'nixpkgs':
    'github:NixOS/nixpkgs/eabc38219184cc3e04a974fe31857d8e0eac098d?narHash=sha256-hekabNdTdgR/iLsgce5TGWmfIDZ86qjPhxDg/8TlzhE%3D' (2022-08-02)

error:
       … while evaluating the attribute 'packages.aarch64-darwin.go-hello'
         at /nix/store/rgv2bk0vc80h1r93267wm5xw61y8vpsm-source/flake.nix:34:11:
           33|         {
           34|           go-hello = pkgs.buildGoModule {
             |           ^
           35|             pname = "go-hello";

       … while calling a functor (an attribute set with a '__functor' attribute)
         at /nix/store/rgv2bk0vc80h1r93267wm5xw61y8vpsm-source/flake.nix:34:22:
           33|         {
           34|           go-hello = pkgs.buildGoModule {
             |                      ^
           35|             pname = "go-hello";

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: function 'anonymous lambda' called without required argument 'vendorSha256'
       at /nix/store/9ks8076lanzwp09dmwy5r3racihsc1ip-source/pkgs/development/go-modules/generic/default.nix:3:1:
            2|
            3| { name ? "${args'.pname}-${args'.version}"
             | ^
            4| , src
> nix --version
nix (Nix) 2.24.5

I looked up in the code I can't quickly find the reason, the vendorSha256 is hardcoded there and there's a clear explanation why however I don't get why it broke.

[shamansir]

Full trace:

       … from call site
         at /nix/store/9ks8076lanzwp09dmwy5r3racihsc1ip-source/lib/attrsets.nix:317:43:
          316|   genAttrs = names: f:
          317|     listToAttrs (map (n: nameValuePair n (f n)) names);
             |                                           ^
          318|

       … while calling anonymous lambda
         at /nix/store/9d1gmwpgd66sxphf865d741y0891wb09-source/flake.nix:69:39:
           68|       # package.
           69|       defaultPackage = forAllSystems (system: self.packages.${system}.go-hello);
             |                                       ^
           70|     };

       … while evaluating the attribute 'packages.aarch64-darwin.go-hello'
         at /nix/store/9d1gmwpgd66sxphf865d741y0891wb09-source/flake.nix:34:11:
           33|         {
           34|           go-hello = pkgs.buildGoModule {
             |           ^
           35|             pname = "go-hello";

       … while calling a functor (an attribute set with a '__functor' attribute)
         at /nix/store/9d1gmwpgd66sxphf865d741y0891wb09-source/flake.nix:34:22:
           33|         {
           34|           go-hello = pkgs.buildGoModule {
             |                      ^
           35|             pname = "go-hello";

       … from call site
         at /nix/store/9ks8076lanzwp09dmwy5r3racihsc1ip-source/lib/trivial.nix:346:7:
          345|     { # TODO: Should we add call-time "type" checking like built in?
          346|       __functor = self: f;
             |       ^
          347|       __functionArgs = args;

       error: function 'anonymous lambda' called without required argument 'vendorSha256'
       at /nix/store/9ks8076lanzwp09dmwy5r3racihsc1ip-source/pkgs/development/go-modules/generic/default.nix:3:1:
            2|
            3| { name ? "${args'.pname}-${args'.version}"
             | ^
            4| , src

Also I noticed that there's something that looks like escaped code in the hash:

...iLsgce5TGWmfIDZ86qjPhxDg/8TlzhE%3D <- %3D looks confusing. However, it could be just a coincidence.

• Added input 'nixpkgs':
    'github:NixOS/nixpkgs/eabc38219184cc3e04a974fe31857d8e0eac098d?narHash=sha256-hekabNdTdgR/iLsgce5TGWmfIDZ86qjPhxDg/8TlzhE%3D' (2022-08-02)

[ElrohirGT]

Hello! I tried to make a PR updating the Go version of the template, maybe that fixes the issue? #89

Here's the fork: https://github.com/ElrohirGT/NixOS-templates/tree/fix/updated-go-template

[transgwender]

Im in the same situation, using on x86_64-linux nixOS. As suggested by @ElrohirGT, updating the Go version and changing the hash to NULL fixed the issue on my end.

[fred441a]

I Have the same issue.